You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-issues@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2013/08/09 20:56:47 UTC

[jira] [Created] (HADOOP-9857) Tests block and sometimes timeout on Windows due to invalid entropy source.

Chris Nauroth created HADOOP-9857:
-------------------------------------

             Summary: Tests block and sometimes timeout on Windows due to invalid entropy source.
                 Key: HADOOP-9857
                 URL: https://issues.apache.org/jira/browse/HADOOP-9857
             Project: Hadoop Common
          Issue Type: Bug
          Components: build, test
    Affects Versions: 3.0.0, 2.1.1-beta
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


Tests are configured to set the entropy source to {{file:///dev/urandom}} to prevent blocking on machines with low entropy.  We've observed that on Windows, this will cause tests to block for 5 seconds trying to access this non-existent path the first time the process does something that needs entropy, such as using a {{SecureRandom}} or creating a {{UUID}}.  This can cause tests to fail due to timeouts.  In addition to the initial 5-second blocking, this causes the JVM to fall back to a slower, non-native seed generation implementation.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira